Wine is effective against cancer and Alzheimer's disease!?

Polyphenols are found to be good on the health, and many studies on them are available nowadays.
An American university study found that polyphenols can prevent cancer from developing. Their experiments proved that polyphenols prevent skin cancer on mice from developing with the probability of 98%.
Polyphenols have biofunctions of preventing normal cells from cancerating.

Another study by a French university reports that old people who drink two or three glasses of wine have one-fourth risk of developing Alzheimer's disease than those who do not drink wine.